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SQL: Compute modulo of rand() in an UPDATE stmt crashes mserver5 #2766

monetdb-team opened this issue Nov 30, 2020 · 0 comments

SQL: Compute modulo of rand() in an UPDATE stmt crashes mserver5 #2766

monetdb-team opened this issue Nov 30, 2020 · 0 comments


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@monetdb-team monetdb-team commented Nov 30, 2020

Date: 2011-01-21 11:37:34 +0100
From: @yzchang
To: SQL devs <>
Version: 11.1.1 (Mar2011) [obsolete]
CC: @njnes, @yzchang

Last updated: 2011-04-28 16:25:40 +0200

Comment 15399

Date: 2011-01-21 11:37:34 +0100
From: @yzchang

User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-GB; rv: Gecko/20101027 Fedora/3.5.15-1.fc12 Firefox/3.5.15
Build Identifier:

The following queries result in a segmentation fault in mserver5. The cause is the combined use of mod() and rand():

create table test (v int);
insert into test values (23), (34), (12), (54);
update test set a = mod(rand(), 32);

GDB says that the problem is in .../monet/default/sql/server/sql_statement.c:708: n->data = push_project(sa, rows, n->data);

Reproducible: Always

Comment 15400

Date: 2011-01-21 11:54:33 +0100
From: @yzchang

The same error exists in the Oct2010 branch.

Comment 15673

Date: 2011-03-28 17:35:57 +0200
From: @sjoerdmullender

The Mar2011 version has been released.

Comment 15722

Date: 2011-04-05 12:45:19 +0200
From: @njnes

Changeset 28933e6ccd80 made by Niels Nes in the MonetDB repo, refers to this bug.

For complete details, see http//devmonetdborg/hg/MonetDB?cmd=changeset;node=28933e6ccd80

Changeset description:

fixed bug #2766

used incorrect structure/pointer leading to the crash, now the correct
list is used.

Comment 15723

Date: 2011-04-05 12:46:10 +0200
From: @njnes

added test to BugTracker-2011/crash_in_modulo_rand.Bug-2766.sql

incorrect pointer was used, now the correct argument list is used.

Comment 15756

Date: 2011-04-28 16:25:40 +0200
From: @sjoerdmullender

The Apr2011 release has been uploaded.

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